Invention Grant
- Patent Title: Bus circuit
- Patent Title (中): 总线电路
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Application No.: US12661675Application Date: 2010-03-22
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Publication No.: US07872517B2Publication Date: 2011-01-18
- Inventor: Xavier Lambrecht , Bernardus Adrianus Cornelis Van Vlimmeren
- Applicant: Xavier Lambrecht , Bernardus Adrianus Cornelis Van Vlimmeren
- Applicant Address: CH Geneva
- Assignee: ST-Ericsson SA
- Current Assignee: ST-Ericsson SA
- Current Assignee Address: CH Geneva
- Priority: EP05108725 20050921
- Main IPC: G06F1/04
- IPC: G06F1/04 ; H03K3/00

Abstract:
Clock control is handed over in a bus circuit from a first circuit (14) to a second circuit (12). A clock conductor (10a) is driven to a predetermined voltage level with the driver circuit of the first circuit after a last clock period following the start of execution of the handover command and to continue driving the clock conductor (10a) to the predetermined voltage level for a first time-interval. The clock conductor (10a) is driven to the predetermined voltage level with the driver circuit of the second circuit after a second time interval following the start of execution of the handover command until a third time interval has elapsed following the end of the second time interval. Subsequently the clock conductor (10a) is driven under control of the clock circuit (140) of the second circuit (14). The first time interval contains a first integer number P1 of periods of a first clock signal of the first circuit and the second and third time interval contain a second and third integer number P2, P3 of periods of a second clock signal of the second circuit, a duration corresponding to the second integer number P2 equaling at least a pulse duration of the first clock signal, a duration corresponding to the first integer number P1 equaling at least a duration corresponding to the second integer number P2 plus one, a duration corresponding to the second plus third integer P2, P3 equaling at least a duration corresponding to the first number P1 plus one.
Public/Granted literature
- US20100189287A1 Bus circuit Public/Granted day:2010-07-29
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